Oh, quite sadly.
Good luck anyway.
This is a learning phase for me in game development. Story and tags for this game are quite well defined already based on my knowledge and experience of what AI can do well today. So, I want to avoid derrail as much as possible from what I know I can do and avoid making this an impossible or a 2 year project.
What I can tell you today about pregnancy is that open source AI video models consider the belly as an extra boob... in animations it moves, shakes, bounces just like a boob does. The same things happens with big asses, they are always "bubble butts".
So, even though the setting and quality might be realistic, the animation is not.